If you're experiencing issues with the Plugable USBC-MSTH2 docking station, start by ensuring your system and graphics drivers are up-to-date—use Windows Update or your GPU manufacturer’s website for updates. Verify you're using the included USB-C cable that supports DisplayPort Alt Mode and that it's connected to a compatible USB-C port (DisplayPort 1.2 or higher).
On Windows, set your display mode to Extend in Display Settings; Chrome OS users should select Extend mode in Display settings. Note that macOS does not support MST, so only mirrored displays are possible. If issues persist, try swapping cables or contact Plugable Support at support@plugable.com.